UMS-Mini
Ultrastable Microwave System

A P P L I C AT I O N S■ Atomic Clocks / Time-scale realization■ RF over fiber■ Quantum Computing■ Radar Local Oscillator■ Test & Measurements■ OCXOs/Oscillators calibration/measurements■ Telecom 5G/6G

F E AT U R E S■ Compact and complete solution comPhotonic microwave technology represents a paradigm shift in microwave signal synthesis.
Introducing Menlo Systems’ Ultrastable Microwave Systems, we present a groundbreaking advancement in microwave technology, for the synthesis of microhertz-level linewidthsignals. Currently, the most established technology for the synthesis of stable microwave
signals is based on up-multiplication of RF signals from oven-controlled crystal oscillators(OCXOs). This method leads to unavoidable and detrimental quadratic upscaling of phasenoise. Our systems are the first commercially available photonic microwave sources thatutilize the phase-coherent division of high-fidelity optical signals into the microwave
domain. By employing this innovative approach, we can drastically reduce optical phasenoise to levels that were previously considered physically impossible with multiplied OCXOs
or room-temperature Sapphire oscillators.
The UMS-Mini is the microwave frequency source with the lowest phase noise on the market. In a compact 200-liter volume, the rack mountable system can be configured to provide multiple output frequencies from the RF to up to 20 GHz (higher on custom request).
It includes a fully autonomous ultra-stable laser and a frequency comb. The system is theresult of years of fine engineering.1, 2, 3

prising an ultrastable laser and an opticalfrequency comb
■ Fully remotely controllable■ Lowest phase noise on the market in thisform factor■ Optional 1 PPS, 10/100 MHz outputs

K E Y S P E C I F I C AT I O N S■ Up to four phase-coherent RF and Micro-wave frequency outputs: 10/100 MHz,
1-20 GHz with guaranteed spectral purity■ Phase noise as low as <-80 dBc/Hz at 1Hz, -160 dBc/Hz at ≥10 kHz from a 10GHz carrier■ Frequency instability (for X-Band signals) as
low as <5E-15 at 1 s, <5E-11 (50 ppt) at
1 day (without drift-removal)■ De-drift option available (to hand over GPSor other reference)■ Class 1 Laser System (depending onconfiguration)

Measurement instrument-limited phase noise trace for a 10 GHz carrier signal.
1) Xie, X. et al. Photonic microwave signals with zeptosecond-level absolute timing noise. Nature Photonics 11, 44–47 (2016).
2) Giunta, M. et al. Compact and ultrastable photonic microwave oscillator. Optics Letters 45, 1140 (2020).
3) Zobel, J. W. et al. Comparison of Optical Frequency Comb and Sapphire Loaded Cavity Microwave Oscillators. IEEE Photonics Technology Letters 31, 1323–1326 (2019).
Technology protected by patents US6785303, US6724788, US7026594, DE10044404, US7804863, US8995796, US8873601, JP4668423, JP5615397, CN103311780

UMS-Mini

Ultrastable Microwave System
Inputs

UMS-Mini (12 HU)

Outputs

10 MHz Ext. Reference

Optical Frequency Comb
Subsystem(e.g.) 10 GHz, >-5 dBm

Optical Ext. Reference

Optical Reference
Subsystem
Optical Signals

1.5 um OFC stable-light
1.5 um ORS stable-light

RF/Microwave Signals

S P E C I F I C AT I O N S
Phase noise (absolute*, dBc Hz-1)
10 MHz

100 MHzFractional frequency stability (absolute*)
10 GHz10 MHzOffset frequency (Hz)100 MHz10 GHzAveraging time (s)1-135-125-80

0.1<5E-14<5E-14<5E-15

10-145-135-1001<5E-14<5E-14<5E-15100-155-145-120

10<1E-13<1E-13<2E-141k-165-150-140100<5E-13<5E-13<2E-1310k-165-155-160

1000<5E-12<5E-12<2E-12100k<-165-155<-160>10000<5E-11<5E-11<2E-11

1M<-165-155<-160

System can be equipped with GPS receiver for long-term steering. De-drift function can be configured for handover at the appropriate time to amore stable reference.
*Inquire for residual.

OUTPUTS
Level, 50 ΩIsolation
Spurius1/100 MHz

Microwave>7 dBm>-5 dBm>70 dB>80 dB<-90 dBc<-70 dBc

O R D E R I N G I N F O R M AT I O N
Product CodeP O W E R / E N V I R O N M E N TA L R E Q U I R E M E N T S
100/115/230 VAC
Operating Voltage
50 to 60 Hz
Line Frequency
22 ± 5 °C
Operating Temperature<200 W
Power Consumption

UMS-Mini

Please call for pricing. Specifications are subject to change without notice. Custom modifications are available, please inquire. The cubic cavity is an NPL patented design that is soldunder a licensing agreement with the National Physical Laboratory (NPL). This configuration of the NPL cavity is intended for terrestrial use only. For further information on spacecustomised or space-qualified cavities, please contact NPL.

Laser Radiation
Class1 Laser Productaccording to DIN EN 60825-1:2015-07

Menlo Systems GmbH
T+49 89 189 166 0
sales@menlosystems.com

www.menlosystems.com

Menlo Systems US
T+1 303 635 6406
ussales@menlosystems.com

Menlo Systems Japan
T+81 907 409 20 21
jpsales@menlosystems.com

Menlo Systems China
T+86 21 6071 1678
chinasales@menlosystems.com

D-UMS-Mini-EN 04/03/2024